US3610855A - Oil circuit breaker including contact braking device - Google Patents

Oil circuit breaker including contact braking device Download PDF

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Publication number
US3610855A
US3610855A US888750A US3610855DA US3610855A US 3610855 A US3610855 A US 3610855A US 888750 A US888750 A US 888750A US 3610855D A US3610855D A US 3610855DA US 3610855 A US3610855 A US 3610855A
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Prior art keywords
movable contact
moving contact
chamber
piston
oil
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Expired - Lifetime
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US888750A
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English (en)
Inventor
Takumi Mitsuhashi
Kenichiro Sasaki
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Inoue Electric Mfg Co Ltd
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Inoue Electric Mfg Co Ltd
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Application filed by Inoue Electric Mfg Co Ltd filed Critical Inoue Electric Mfg Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H01H3/605—Mechanical arrangements for preventing or damping vibration or shock making use of a fluid damper

Definitions

  • Kenichiro Sasaki both of Kyoto, Japan Appl. No. 888,750 Filed Dec. 29, 1969 Patented Oct. 5, 1971 Assignee lnoue Electric Mfg. Co., Ltd.
  • OIL CIRCUIT BREAKER INCLUDING CONTACT BRAKING DEVICE parted from the stationary contacts but before the moving contact goes out of a quenching chamber.
  • the quenching chamber is composed so that when the moving contact has separated from the stationary contacts and comes to a most suitable position in the chamber for extinguishing the arc that has arisen between both contacts, interruption of a specified current may be carried out.
  • the position is decided with concern for the frequency of the interrupting current and the parting speed of the moving contact. Interruption is achieved by recovery of the insulation among the stationary and moving contacts at the time of current-zero after opening of the contacts.
  • the parting distance is related to the parting speed of the moving contact.
  • the speed of the moving contact depends on not only the actuating force externally given by the tripping motion but also the self-made gas pressure in the chamber caused by the arcing heat. With increase of gas pressure, the parting speed of the moving contact increases too. Arcing heat is higher when the current becomes larger so that the gas pressure is also higher. For oil-flow to disturb the area about the moving contact end it is necessary to prepare a flowing oil path.
  • the oil-flow As to the oil-flow (blast), generally there are two means to form the oilpath.
  • One is axial-flow by use of pressure difierentials gradually becoming smaller toward lower parts of the chamber and the other is crossflow, transverse to the arc length, through openings provided in the sidewall of the chamber.
  • the velocity of oil-flow is naturally increased with increase of pressure owing to the above-mentioned arcing heat.
  • too high a pressure requires high mechanical strength of the chamber.
  • Arc pressure becomes higher with extension of the arc length. Therefore, it is required to finish the interruption while the arc length does not become too long.
  • the principal object of this invention is to provide a small quenching chamber having reliable interrupting charactcristics.
  • Another object of this invention is to give a braking (restraining) action to the moving contact departing from the stationary contacts. This braking action works only in the neighborhood of the most suitable position for quenching in the chamber. By this action, velocity of the moving contact, in the neighborhood of the most suitable position for quenching in the chamber, decreases. In other words, the time required for the contact to pass the prescribed neighborhood in the chamber becomes longer. This means that there will be more in the chamber is made long, it is desirable to bring quickly the moving contact to the above-mentioned neighborhood, in order to increase the chance of encountering zero-current. In this manner, it will be possible to increase the number of times to encounter the first or following zero-current. To increase the initial parting velocity of the moving contact is another object intended for this invention.
  • FIG. I is a vertical section of the braking device of the oil circuit breaker of the invention.
  • FIG. 2 is a perspective view of the external cylinder used in the braking device of FIG. 1;
  • FIG. 3 is a view similar to FIG. 1 but showing the internal cylinder
  • FIG. 4 is a vertical section of the quenching chamber of the circuit breaker.
  • FIG. 5 is a graph showing the braking characteristics of the device shown in FIG. 1.
  • the braking device of the invention is designated by 10.
  • a cylindrical case 11 is enclosed by a base 12 which has a projecting part 13.
  • Upper part of case 11 forms a flange 14.
  • cover 15 is fixed to case 11.
  • the cover 15 has a projecting part 16 corresponding to base projection 13.
  • An internal cylinder 17 is fitted to the respective projections 13 and 16 at both ends.
  • the cylinder 17 has a couple of slots 18 and 19 on the upper end, as shown in FIG. 3, and is provided with two holes 20 and 21 for oil path.
  • an external cylinder 22 is slidably fitted. Lower end of the external cylinder has a fiange 23 which supports a coil spring 24 against the cover 15.
  • the spring 24 biases the external cylinder downward.
  • the cylinder 22 has a U-shaped bridge 25 with a center hole 27 through which a piston rod 33 passes.
  • two holes 30 and 31 for oil flow are formed in the sidewall of the cylinder 22, they are spaced apart the same distance as the two holes 20 and 21 of the internal cylinder.
  • the rod 33 has a piston 32 and projects through the bridge hole 27 and cover 15 upwardly.
  • FIG. 4 shows the quenching chamber 40.
  • the chamber is composed of quenching plates 42 of pile assembly inside the cylindrical wall 41.
  • the quenching plates are so assembled as to provide openings 45, to 45, for oil-jet along the moving contact route from the bottom end of the stationary contacts.
  • Lower part of cylindrical wall 41 fonns a proper pressure cabin 46.
  • the lower end of the moving contact 44 is jointed mechanically to the coupler 47 on the top of piston rod 33 through a suitable linkage. Thus, the motion of moving contact 44 is transmitted to the piston rod 33.
  • FIG. 1 and FIG. 4 show the closed position of the breaker.
  • piston rod 33 and piston 32 are in the upper limit and is at rest and the external cylinder also is at rest against the spring by fitting of the top end of piston 32 and bridge end 26.
  • FIG. 5 shows the characteristic curves with the braking device.
  • the curves are indicated in time (X-axis) and transferring distance (Y-axis) 5,, means the starting time when the moving contact begins to part the stationary contacts and 8 5, means the distance from the stationary contact to final static position of the moving contact at the end of its whole movement.
  • the characteristic for no current operation or small current interrupting is indicated by curve C, and curve C, is for the case of large current interruption.
  • S is a position at which the braking action begins and corresponds to distance (from S to the upper internal surface a (FIG. 4 of jet opening 45
  • S is a position at which the braking action finishes, and corresponds to distance (from S,,) to the lower internal surface b (FIG.
  • curve C is nearly a straight line, with a gentle slope for the final motion of the contact 44 receiving shock-absorbing action.
  • Curve C indicates that the moving contact reaches S, in less time of t,, than in case of C, and takes longer time t,, to move up to 8,. If the suitable position for the interrupting currentis in neighborhood of opening 45, moving velocity of the contact 44 is suddenly decreased. Therefore, when passing the position, the chance of encountering zero-current is surely increased. The distance to S, beginning the braking action becomes longer with the interrupting current increases and vice versa.
  • An oil circuit breaker comprising: an arc-extinguishing chamber; stationary contacts arranged in said chamber; at least one movable contact adapted to depart, at the time of interruption, from said stationary contacts to travel through said chamber and to finally to go out thereof; and a braking device including means adapted to perform braking action on said movable contact when said contact passes the position moist suitable for are extinguishing, so as to make it easier for the zero-current time to be encountered, and further including means for releasing said braking action on said movable contact when it has passed the neighborhood of said most suitable position at the time of interruption.

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  • Circuit Breakers (AREA)
US888750A 1968-12-30 1969-12-29 Oil circuit breaker including contact braking device Expired - Lifetime US3610855A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44000482A JPS4935951B1 (enrdf_load_stackoverflow) 1968-12-30 1968-12-30

Publications (1)

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US3610855A true US3610855A (en) 1971-10-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US888750A Expired - Lifetime US3610855A (en) 1968-12-30 1969-12-29 Oil circuit breaker including contact braking device

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US (1) US3610855A (enrdf_load_stackoverflow)
JP (1) JPS4935951B1 (enrdf_load_stackoverflow)
GB (1) GB1296227A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193053A (en) * 1978-01-30 1980-03-11 S & C Electric Company Circuit interrupting device with arcing rod speed modifying means
EP1017071A3 (en) * 1998-12-30 2002-11-06 ABB Service Srl Improved circuit breaker
CN103280375A (zh) * 2013-05-24 2013-09-04 沈阳华德海泰电器有限公司 一种用于真空断路器操作机构的油缓冲器
DE102017212021A1 (de) * 2017-07-13 2019-01-17 Siemens Aktiengesellschaft Anordnung und Verfahren zum Dämpfen von Schaltbewegungen in Hochspannungsleistungsschaltern
CN115394580A (zh) * 2021-05-25 2022-11-25 河南森源电气股份有限公司 一种断路器用缓冲器
CN117690750A (zh) * 2024-02-01 2024-03-12 深圳市超越电气技术有限公司 一种配电网电气设备保护用真空断路器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696604A (en) * 1922-03-30 1928-12-25 Gen Electric Fluid-break switch
US1768949A (en) * 1923-12-10 1930-07-01 Honeywell Regulator Co Circuit-controlling means
US2156388A (en) * 1935-11-25 1939-05-02 Frida Strauss Electric switch
US2804513A (en) * 1953-12-31 1957-08-27 Gen Electric Circuit breakers dashpot mechanism
US3118996A (en) * 1960-12-15 1964-01-21 Forwald Haakon Contact operating means for air blast circuit breaker
DE1233458B (de) * 1966-07-06 1967-02-02 Licentia Gmbh Leistungsschalter mit Lichtbogenloeschung durch ein stroemendes Loeschmittel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696604A (en) * 1922-03-30 1928-12-25 Gen Electric Fluid-break switch
US1768949A (en) * 1923-12-10 1930-07-01 Honeywell Regulator Co Circuit-controlling means
US2156388A (en) * 1935-11-25 1939-05-02 Frida Strauss Electric switch
US2804513A (en) * 1953-12-31 1957-08-27 Gen Electric Circuit breakers dashpot mechanism
US3118996A (en) * 1960-12-15 1964-01-21 Forwald Haakon Contact operating means for air blast circuit breaker
DE1233458B (de) * 1966-07-06 1967-02-02 Licentia Gmbh Leistungsschalter mit Lichtbogenloeschung durch ein stroemendes Loeschmittel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193053A (en) * 1978-01-30 1980-03-11 S & C Electric Company Circuit interrupting device with arcing rod speed modifying means
EP1017071A3 (en) * 1998-12-30 2002-11-06 ABB Service Srl Improved circuit breaker
CN103280375A (zh) * 2013-05-24 2013-09-04 沈阳华德海泰电器有限公司 一种用于真空断路器操作机构的油缓冲器
CN103280375B (zh) * 2013-05-24 2015-07-01 沈阳华德海泰电器有限公司 一种用于真空断路器操作机构的油缓冲器
DE102017212021A1 (de) * 2017-07-13 2019-01-17 Siemens Aktiengesellschaft Anordnung und Verfahren zum Dämpfen von Schaltbewegungen in Hochspannungsleistungsschaltern
US11569047B2 (en) 2017-07-13 2023-01-31 Siemens Energy Global GmbH & Co. KG Assembly and method for damping switching movements in high-voltage circuit breakers
CN115394580A (zh) * 2021-05-25 2022-11-25 河南森源电气股份有限公司 一种断路器用缓冲器
CN117690750A (zh) * 2024-02-01 2024-03-12 深圳市超越电气技术有限公司 一种配电网电气设备保护用真空断路器
CN117690750B (zh) * 2024-02-01 2024-04-26 深圳市超越电气技术有限公司 一种配电网电气设备保护用真空断路器

Also Published As

Publication number Publication date
JPS4935951B1 (enrdf_load_stackoverflow) 1974-09-26
GB1296227A (enrdf_load_stackoverflow) 1972-11-15

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